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<H1>IBM Visualization Data Explorer Programmer&#39;s Reference</H1>
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<H3><A NAME="HDRDXMP" HREF="progu097.htm#PToC_332">DXMap</A></H3>
<A NAME="IDX1877"></A>
<A NAME="IDX1878"></A>
<A NAME="IDX1879"></A>
<P><STRONG>Function</STRONG>
<P>
Interpolates data values at sample points.
<P><STRONG>Syntax</STRONG>
<BR>
<TT><STRONG><BR>
&#35;include &lt;dx/dx.h&gt;<BR>
<P><BR>
Object DXMap(Object object, Object map, char *src, char *dst)<BR>
</STRONG></TT><BR>
<P><STRONG>Functional Details</STRONG>
<P>
This function provides a simple generic tool for interpolation.
Object <TT><STRONG>object</STRONG></TT>
may be either a Field, a Composite Field,
or an Array.
In the first two cases, the component specified by
<TT><STRONG>src</STRONG></TT> is used to sample
<TT><STRONG>map</STRONG></TT>;
the results of the interpolation are placed in the component specified
by <TT><STRONG>dst</STRONG></TT>, and <TT><STRONG>object</STRONG></TT> is
returned.
If <TT><STRONG>object</STRONG></TT> is an Array, it is used directly to
interpolate <TT><STRONG>map</STRONG></TT>, and an Array containing
the interpolated values is returned;
in this case, the <TT><STRONG>src</STRONG></TT> and
<TT><STRONG>dst</STRONG></TT>
parameters are ignored.
<P>
If
<TT><STRONG>
map
</STRONG></TT>
represents a data Field, it must be a Field, a Composite Field, or
an Interpolator.  The
<TT><STRONG>
src
</STRONG></TT>
component of this data Field is used to generate the values at the
sample points.
<P>
If
<TT><STRONG>
map
</STRONG></TT>
is an Array, this routine creates a resulting Array that
consists of the appropriate number of copies of the contents of the
<TT><STRONG>
map
</STRONG></TT>
Array (which must contain exactly one item).  This result is
then handled as previously described:
if
<TT><STRONG>
object
</STRONG></TT>
is a Field or a Composite
Field, the result Array is added to the Field using the component name
specified by
<TT><STRONG>dst</STRONG></TT>.  Otherwise,
the resulting Array is returned.  This
form is used to create a constant data value at all sample
points.
<P>
<TT><STRONG>
DXMapCheck
</STRONG></TT>
should be called before
<TT><STRONG>
DXMap
</STRONG></TT>
to check the compatibility of the input
<TT><STRONG>
object
</STRONG></TT>
and
<TT><STRONG>map</STRONG></TT>.
<P><STRONG>Return Value</STRONG>
<P>
Returns an Object (see above) or returns <TT><STRONG>NULL</STRONG></TT>
and sets an error code.
<P><STRONG>See Also</STRONG>
<P>
<TT><STRONG>
<A HREF="progu219.htm#HDRDXIE">DXInterpolate</A>,
<A HREF="progu239.htm#HDRDXMPA">DXMapArray</A>,
<A HREF="progu240.htm#HDRDXMPC">DXMapCheck</A>,
<A HREF="progu253.htm#HDRDXNI">DXNewInterpolator</A>
</STRONG></TT>
<P>
<A HREF="progu067.htm#HDRINADMG">14.2 , "Interpolation and Mapping"</A>.
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